Suspicion is a sense of mistrust in which a person doubts a proposition, including those regarding the claims or honesty of others, or believes others to be guilty of some type of wrongdoing or crimes without sure proof. Suspicions of error or evil can often be easily aroused in response to objects, ideas or circumstances that differ from expectations.

A person does not incur suspicion unless he has done the thing; and if he has not done it wholly he has done it partly; and if he has not done it partly, he has a mind to do it; and if he has not had a mind to do it, he has seen others doing it and enjoyed

Julius Cæsar divorced his wife Pompeia, but declared at the trial that he knew nothing of what was alleged against her and Clodius. When asked why, in that case, he had divorced her, he replied: "Because I would have the chastity of my wife clear even of suspicion."

As to Cæsar, when he was called upon, he gave no testimony against Clodius, nor did he affirm that he was certain of any injury done to his bed. He only said, "He had divorced Pompeia because the wife of Cæsar ought not only to be clear of such a crime, but of the very suspicion of it."